Performance issues for VOIP in Access Networks
Das Gupta, Jishu (2005) Performance issues for VOIP in Access Networks. University of Southern Queensland.
The is a general consensus that the Quality of Service (QoS) of Voice over Internet Protocol (VOIP) is of growing importance for research and study.
In this dissertation we investigate the performance of VOIP and the impact of resource
limitations in the performance of Access Networks. The impact of VOIP performance in
access networks is particularly important in regions where Internet resources are limited and the cost of improving these resources is prohibitive.
It is clear that perceived VOIP performance, as measured by mean opinion score in
experiments where subjects are asked to rate communication quality, is determined by end to end delay on the communication path, delay variation, packet loss, echo, the coding
algorithm in use and noise. These performance indicators can be measured and the
contribution in the access network can be estimated. The relation between MOS and
technical measurement is less well understood. We investigate the contribution of the access network to the overall performance of VOIP services and the ways in which access
networks can be designed to improve VOIP performance. Issues of interest include the
choice of coding rate, dynamic variation of coding rate, packet length, methods of
controlling echo, and the use of Active Queue Management (AQM) in Access Network
Methods for analyzing the impact of the access network on VOIP performance will be
surveyed and reviewed. Also, we consider some approaches for improving performance of
VOIP by doing some experiment using NS2 simulation software with a view to gaining a
better understanding of the design of access networks.
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|Subjects:||Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > OTHER INFORMATION AND COMPUTING SCIENCES (089900)|
Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > OTHER INFORMATION AND COMPUTING SCIENCES (089900) > Information and Computing Sciences not elsewhere classified (089999)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Department:||Maths & Computing|
|Institution:||University of Southern Queensland|
|Copyright Owner:||Copyright 2005 Jishu Das Gupta|
|Deposited On:||28 Feb 2008|
|Last Modified:||09 Jun 2010 22:56|
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